Public Course Visibility & End of Term

If a course is set with public visibility, what happen at the "end of term"? I don't have an easy way to test the scenario, so perhaps someone can help. I am hoping to leave the course open as an archive, much as Laura Gibbs does. Do I just leave the end of term date undefined?

And here is the settings page with the dates (I love how we can manually create courses as needed at my school, hence the name of that subaccount... I don't even know what a subaccount is exactly, but that's how my school has it set up for us):

And here is the settings page with the dates (I love how we can manually create courses as needed at my school, hence the name of that subaccount... I don't even know what a subaccount is exactly, but that's how my school has it set up for us):